# define _CRT_SECURE_NO_WARNINGS 1
# include<stdio.h>
int strlen(char* x)
{
	int count = 0;
	while(*x != '\0')
	{
		x += 1;
		count++;
	}
	return count;
}
int main()
{
	char arr[] = "123456789";
	int ret = 0;
	ret = strlen(arr);
	printf("%d", ret);
}